Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84e96bbb4c113f9…

MALICIOUS

PDF

45.0 KB Created: 2021-06-11 00:15:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a133ca7d76287159c3358154d0a6e6f9 SHA-1: 0bb815f04b874dc278912e928ea99368f2bb4a67 SHA-256: d84e96bbb4c113f956742b0dec0d1c07eff095739f6e854ad2e1ee6e4c623942
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-hack-points-on-roblox-hide-and-seek-game-hack. The document's structure and embedded links suggest an attempt to trick users into visiting these sites, likely to download further malware or engage in phishing. No scripts were extracted, but the PDF's nature and the presence of malicious links strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/how-to-hack-points-on-roblox-hide-and-seek-game-hack In PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/pokemon-go-free-accounts-list_GM1094591345.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/fkrepository/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://elibraryfk.unjani.ac.id/elibrary/repository/free-25-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51ED 25020 bytes
SHA-256: fe75289fbc99be0c230e7f5b7ad0b561a41f868358ad564f0312a232d745d619
font_01_sfnt_off00008b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3F 18896 bytes
SHA-256: 3abfa420321e2a754c1c46634dd6d888f1c7f22ca0c267aceacb7fff624811b2

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